I am trying to hack windows server 2003 sp2, i can see a lot of services running on target, there is also a lot of backdoors listing on ports like netbus, remote-everything ....
But Firewall (as i guess) is refusing any tcp connection, except on some ports
is there any way to bypass the firewall?

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UDP spoofing is my best guess, can you tell which version of the networking it runs?
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Andrew SmithAug 2 '12 at 20:09

We would need a lot more data about your testing setup to really help. Can you run a packet sniffer on the server to see if your packets are reaching your target?
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schroeder♦Aug 2 '12 at 20:16

OK I see sp2 havent read it - with this you can maybe crash firewall? Do you know what hardware does it run?
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Andrew SmithAug 2 '12 at 20:53

i ma sure that packets are reaching firewall, because when metasploit tries to create the reverse connection, i receive a message says : connection refused by host
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user1028Aug 2 '12 at 21:10

i do not know what u exactly mean by version of networking, i am working on a LAN, and there is one 3layer switch between my machine and target machine,
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user1028Aug 2 '12 at 21:15